| Karl Ritter von Czyhlarz | |
| Native Name: | Karel Cihlář |
| Native Name Lang: | Czech |
| Birth Date: | 17 August 1833 |
| Birth Place: | Lovosice, Bohemia, Austro-Hungarian Empire |
| Death Place: | Vienna, Austria, Austro-Hungarian Empire |
| Nationality: | Austrian |
| Alma Mater: | Charles University in Prague |
| Occupation: | jurist, politician |
Karl Ritter von Czyhlarz, or Karel Cihlář (August 17, 1833, Lovosice, Bohemia - July 21, 1914, Vienna) was a Bohemian-Austrian jurist, politician.
He taught as a professor at the Charles University in Prague (1858-1892), University of Vienna (1892-1904).
He was a specialist of the Roman law.
Karl was a member of an assembly of Bohemia (1866-1886), and a member of the Upper Chamber of the Austrian Reichsrat (1898-).